Open fire-door for furnaces.



No. 632,6I5. Patented Sept. 5, |899. 0. A. ALEXANDER.

('.IPEN FIRE DOOR FOR FURNACES.

(Application filed Mur. 30, 1899.)

@ittoznm NiTnD STATES PATENT OPEN FIRE-DOOR FOR FURNACES.

SPECIFICATION forming part of Letters Patent No. 632,615, datedSeptember 5, 1899.

Application filed March 30, 1899.

Be it known that I, OLivER-AUGUsTUs AL- EXANDER, a citizen of the UnitedStates, residing at San Francisco, in the county of San Francisco andState of California, have invented a cert-ain new and useful Improvementin Open Fire-Doors for Furnaces, of which the following is a full,clear, and exact description.

This invention relates to doors for furnaces, and more especially todoors of the kind forming the subject of Patent No. 329,603, grantedNovember 3, 1885, to Andrew J. Stevens, and which doors are designedprimarily for locomotive-boiler furnaces; and the object of theinvention is to provide for the more convenifenil; feeding andeconomical combustion of the In carrying out my invention I provide themain door with a supplemental door, through whichlatter the fuel maybefed without opening the main door, and adjacent to this supplementaldoor I arrange a dedector plate or shield which may be readily put inposition and removed, and which also may be adjusted as to inclinationso as to direct the iniiowin g air in order to conserve the fire andprotect the boiler against the inrushing of large volumes of cold air,all as I will proceed now more particularly to set forth and nallyclaim.

In the accompanying drawings illustrating my invention, in the severalligures of which like parts are similarly designated, Figure l is afront elevation. Fig. 2 is a top plan view. Fig. 3 is a verticalsection, taken substantially in the plane of line 3 3, Fig. I, andshowing in dotted lines the plate or shield in or about the positionshown in Fig. el, and also showing in dotted lines the supplemental dooropened. Fig. 4 is avertical section, taken substantially in the plane ofline 4 4, Fig. l.

a may represent a portion of-a furnace, and b is the door hinged theretoat c and provided with a latch and keeper d, all of approvedconstruction. The door b is provided with the supplemental door e,hinged thereto at f and adapted to open outwardly, as indicated bydotted lines in Fig. 3, so as to uncover an opening g in the main doorthrough which the fuel may be fed Without opening the main door. Onopposite sides of this opening g and on the door b are constructed theopen sockets h h.

i is a plate or shield of met-al having the latsenn Na. 711,125. No manerally-extended journals 7o, which find bearings in the sockets h whenthe said plate or shield is inserted through the opening g of the doorZ), so that the said plateor shield may be given a rocking motion in thesaid sockets as in bearings. An arm projects upwardly from one side ofthe plate or shield i', and in the path of movement of said arm Z isarranged an adjusting device m of any approved construction andpreferably, as herein shown, consisting of a T-headed screw, which isadjustably supported in a bracket n made fast to any appropriatestationary part of the furnace. This screw may be adjusted in thedirection of its length in said bracket, and, if necessary, may be heldin such adjustment by aset-screw or jam-nut o. As will be seen bycomparison of Figs. 3 and 4, the angle of inclination of the shield orplate may be varied by running out and in the adjusting device m, andthereby the incoming air may be distributed more or less widely over thesurface of the fire.

My invention differs from prior inventions, in that the plate or shieldmay be readily removed without detaching any portion of the door andwithout detaching any support for the said plate, and also in the factthat the said plate may be readily adjusted to vary its angle ofinclination, and also in the fact that as the door is open the plate orshield parts from its adjusting device and falls against the door clearof the mouth of the furnace. Obviously when not desired the shield orplate may be wholly removed Without in any wise dismantling the door orits appurtenances.

The door may be supplied also with a protecting-shield or nre-shield pand with a series of constant or regulated air-inlets r.

Obviously my invention may be applied to doors already in use byaffixing thereto suitable bearings to receive the shield and byattaching to some fixed portion of the furnace the adjusting device.

I do not limit my invention to the exact details of construction, butesteem as Within my invention such variations as will accomplish theready application and removal of the plate or shield and its adjustmentas to inclination within the fire-box or combustion-chamber.

The use of shields of the character herein described has demonstratedtheir capacity to reduce the quantity of smoke due to imper- IOO fectcombustion and also to enable the fireman to control his re.

l. A furnace-door, provided with bearings, a delector plate or shieldarranged in said bearings, an arm projecting from said plate, and anadjusting device fixed beyond the door and cooperating with said arm tovary the augle of inclination of the plate or shield and release saidshield when the door is swung open, substantially as described.

2. A furnace-door, provided with a supplemental feed-door, a shieldpivoted to the main door Within the openin g for the supplemental door,an arm projecting from said plate or shield, and a T-shaped set-screwarranged on a fixed portion of the furnace and in the path of movementof said arm and adjustable to vary the angle of inclination of the plateor shield, substantially as described.

3. A furnace-door, provided with a supplemental feed-door, open socketsarranged upon opposite sides of said door-opening, a deector plate orshield having laterally-extended journals to engage said sockets asbearings, the plate or shield projecting into the furnace or fire-boxthrough said supplemental dooropening, an arm projecting from said plateor shieldv upwardly, a T-shaped set-screw and a bracket therefor securedremotely from the door7 the said set-screw beingr arranged in the pathof movement of said arm and adjustable to vary the angle of inclinationof the plate or shield, the shield being bodily removable from itsbearings and thus detachable from the door without dismantling the dooror its appurtenances, substantially as described.

In testimony whereof I have hereunto set my hand this 27th day of March,A. D. 1899.

OLIVER AUGUSTUS ALEXANDER.

Witnesses:

A. D. CRUTCHFIELD, C. HOLMES CLARK.

